889
FNCA52 TJSJ 110730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST FRI SEP 11 2026
DISCUSSION
DESPITE RECENT WETTING RAINS IN SOUTHERN PUERTO RICO, ELEVATED
KBDI VALUES DEMONSTRATE THAT DEEPER SOIL AND FUEL LAYERS REMAIN
DRY. THE COMBINATION OF BREEZY ESE WINDS AND INCOMING DRIER AIR
WILL MAINTAIN A LOW-TO-MODERATE FIRE DANGER RISK ACROSS THESE
AREAS TODAY, THOUGH LOCALIZED SPIKES IN THREAT LEVELS REMAIN
POSSIBLE. WE WILL CLOSELY MONITOR EVOLVING WEATHER PATTERNS AND
FUEL MOISTURE TRENDS FOR ANY POTENTIAL ESCALATION IN FIRE RISK.
PRZ014-112000-
SOUTHEAST COASTAL PLAINS-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 91 (+3) 75 (-3) 92
RH % (24H TREND) 56 (-14) 89 (-3) 51
WIND 20FT/EARLY(MPH) E 16 E 13 E 18
WIND 20FT/LATE(MPH) E 17 NE 12 E 19
MIXING HGT(FT-AGL/MSL)4570 5590
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 73120 95030
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-112000-
SOUTHERN HILLS-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 0 10
TEMP (24H TREND) 89 (+5) 72 (-3) 89
RH % (24H TREND) 61 (-13) 95 (0) 57
WIND 20FT/EARLY(MPH) E 13 E 12 E 13
WIND 20FT/LATE(MPH) E 13 E 12 E 14
MIXING HGT(FT-AGL/MSL)5110 6000
TRANSPORT WND (MPH) E 17 E 17
VENT RATE (KT-FT) 76650 90000
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-112000-
NORTH COASTAL PLAINS-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 0 0 0
TEMP (24H TREND) 91 (+1) 75 (-3) 90
RH % (24H TREND) 62 (-8) 95 (-1) 60
WIND 20FT/EARLY(MPH) E 14 E 17 E 14
WIND 20FT/LATE(MPH) E 19 E 12 NE 18
MIXING HGT(FT-AGL/MSL)4870 5320
TRANSPORT WND (MPH) E 17 E 18
VENT RATE (KT-FT) 73050 85120
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-112000-
NORTHERN HILLS-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 10
TEMP (24H TREND) 90 (+2) 73 (-2) 89
RH % (24H TREND) 62 (-8) 97 (-1) 61
WIND 20FT/EARLY(MPH) E 12 E 14 E 12
WIND 20FT/LATE(MPH) E 17 E 10 NE 17
MIXING HGT(FT-AGL/MSL)5900 5520
TRANSPORT WND (MPH) E 14 E 15
VENT RATE (KT-FT) 70800 71760
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-112000-
WEST COAST-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 40
TEMP (24H TREND) 93 (+3) 73 (-3) 92
RH % (24H TREND) 62 (-8) 98 (+1) 58
WIND 20FT/EARLY(MPH) E 14 E 14 E 12
WIND 20FT/LATE(MPH) E 14 E 12 E 14
MIXING HGT(FT-AGL/MSL)4510 5370
TRANSPORT WND (MPH) E 12 E 9
VENT RATE (KT-FT) 45100 42960
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-112000-
EASTERN INTERIOR-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 89 (+3) 73 (-4) 89
RH % (24H TREND) 63 (-11) 95 (-2) 60
WIND 20FT/EARLY(MPH) E 13 E 13 E 12
WIND 20FT/LATE(MPH) E 14 E 13 E 13
MIXING HGT(FT-AGL/MSL)5380 6020
TRANSPORT WND (MPH) E 17 E 16
VENT RATE (KT-FT) 80700 84280
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-112000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 84 (+3) 72 (-3) 84
RH % (24H TREND) 70 (-12) 96 (-3) 67
WIND 20FT/EARLY(MPH) E 12 E 11 E 10
WIND 20FT/LATE(MPH) E 13 E 11 E 11
MIXING HGT(FT-AGL/MSL)4180 5220
TRANSPORT WND (MPH) E 18 E 17
VENT RATE (KT-FT) 66880 78300
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-112000-
CENTRAL MOUNTAIN RANGE-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR CLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 20 0 20
TEMP (24H TREND) 88 (+6) 69 (-4) 87
RH % (24H TREND) 62 (-14) 98 (+1) 60
WIND 20FT/EARLY(MPH) E 10 E 9 E 9
WIND 20FT/LATE(MPH) E 10 E 8 NE 12
MIXING HGT(FT-AGL/MSL)7150 6910
TRANSPORT WND (MPH) E 12 E 14
VENT RATE (KT-FT) 71500 82920
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-112000-
CAYEY MOUNTAIN RANGE-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 10
TEMP (24H TREND) 85 (+4) 71 (-3) 85
RH % (24H TREND) 69 (-12) 95 (-4) 64
WIND 20FT/EARLY(MPH) E 12 E 10 E 11
WIND 20FT/LATE(MPH) E 12 E 10 E 12
MIXING HGT(FT-AGL/MSL)4660 5420
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 74560 86720
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-112000-
VIEQUES-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 10
TEMP (24H TREND) 89 (+1) 79 (-2) 89
RH % (24H TREND) 61 (-8) 81 (-7) 59
WIND 20FT/EARLY(MPH) E 16 E 17 E 14
WIND 20FT/LATE(MPH) E 16 E 16 E 16
MIXING HGT(FT-AGL/MSL)3550 4810
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 56800 81770
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-112000-
CULEBRA-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 10
TEMP (24H TREND) 90 (+2) 80 (-2) 90
RH % (24H TREND) 64 (-10) 83 (-6) 61
WIND 20FT/EARLY(MPH) E 16 E 16 E 16
WIND 20FT/LATE(MPH) E 16 E 16 E 16
MIXING HGT(FT-AGL/MSL)3470 4510
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 55520 72160
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-112000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER CLEAR CLEAR MCLEAR
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 20
TEMP (24H TREND) 93 (+3) 75 (-3) 93
RH % (24H TREND) 58 (-7) 91 (+2) 53
WIND 20FT/EARLY(MPH) E 19 E 20 E 17
WIND 20FT/LATE(MPH) SE 20 E 18 E 20
MIXING HGT(FT-AGL/MSL)4670 5560
TRANSPORT WND (MPH) E 21 E 16
VENT RATE (KT-FT) 84060 77840
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-112000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER CLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 20 10
TEMP (24H TREND) 88 (+1) 79 (-2) 88
RH % (24H TREND) 63 (-8) 85 (-5) 60
WIND 20FT/EARLY(MPH) E 17 E 17 E 16
WIND 20FT/LATE(MPH) E 17 E 17 NE 16
MIXING HGT(FT-AGL/MSL)3480 4770
TRANSPORT WND (MPH) E 20 E 22
VENT RATE (KT-FT) 59160 90630
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-112000-
ST CROIX-
330 AM AST FRI SEP 11 2026
TODAY TONIGHT SAT
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 10 30
TEMP (24H TREND) 88 (0) 79 (-2) 89
RH % (24H TREND) 66 (-5) 86 (-6) 64
WIND 20FT/EARLY(MPH) E 17 E 17 E 16
WIND 20FT/LATE(MPH) E 17 E 17 E 16
MIXING HGT(FT-AGL/MSL)4240 5240
TRANSPORT WND (MPH) E 22 E 21
VENT RATE (KT-FT) 80560 94320
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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